ML18139B050

LER 81-002/03L-0:on 810105,PT-27A Revealed Loss of Heat Tracing for Panel 10 Circuits 1A & 1B & Panel 11 Circuit 4A. Caused by Open Heating Elements.Defective Heat Tracing Tape Replaced

ML18139B050
Person / Time
Site:	Surry
Issue date:	01/30/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139B048	List: ML18139B047 ML18139B049 ML18139B050 ML18139B051 ML18139B052 ML18139B053
References
LER-81-002-03L-01, LER-81-2-3L-1, NUDOCS 8102050576
Download: ML18139B050 (2)

Text

Ll!SEE EVENT REPORT CONTROL BLOCK:

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VENT DESCRIPTION AND PROBABLE CONSEQUENCES@

With Unit No.2 at 100% power, PT-27A revealed that amp readings for Panel 10 circuit lA

& lB and Panel 11 circuit 4A, were below the acceptance criteria stipulated in the PT.

This event is contrary to T.S.3.3.A.4 and is reportable per T.S.6.6.2.b.(2). The redundant heat tracing circuits were operable, therefore, the health and safety of the public were not affected.

9 80 SYSTEM CAUSE CAUSE COMP. VALVE HI@ ~@w@ IH IE , A, T, E, R,e tu@

CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE I sj w@

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30 31 1~32 ACTION FUTURE EFFECT SHUTDOWN ~ ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS I..:::) SUBMITTED FORM SUB. SUPPLIER MANUFACTURER

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43 IT 11 !8 IS J 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

The loss of heat tracing was due to open heating elements There were no indications of physical damage.

The defective heat tracing was replaced and tested. A design change has been initiated to *change *the manner by which these -borate'd "lines are 'heat traced.

9 BO i'ACILITY STATUS  % POWER OTHER STATUS @ METHOD OF DISCOVERY DISCOVERY DESCRIPTION @

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,CTIVITY CONTENT Q\

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NUMBER A TYPE DESCRIPTION~

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TYPE DESCRIPTION ".::.:)

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04) 357-3184 EX't 21();8 69 aa ;;:

..ATTACHMENT 1 SURRY POWER STATION, UNIT NO. 2 e e DOCKET NO: 50-281 REPORT NO: 81-002/031-0 EVENT DATE: 01-05-81 TITLE OF EVENT: HEAT TRACING FAILURE

1. DESCRIPTION OF EVENT:

With Unit No. 2 at 100% power, PT-27A revealed that the amp readings for Panel 10 circuit lA and lB and Panel 11 circuit 4A (BIT outlet, MOV-2867D and BIT Recirc. return respectively) were below the acceptance criteria stipulated in the PT. This event is contrary to Technical Specification 3.3.A.4, and is re-portable per Technical Specification 6.6.2.b(2).

2. PROBABLE CONSEQUENCES AND STATUS OF REDUNDANT EQUIPMENT:

The heat tracing circuits are intended to maintain a fluid temperature above

• that-,,u-e*eded 0for***,fl,ow. *-.:'.flie 11:edundant**heat tracing circuits* were operable, there-fore, the health and safety of the public were not affected.

3. CAUSE:

The loss of heat tracing was due to open heating elements. There were no in-dications of physical damage to the heat tape.

4. IMMEDIATE CORRECTIVE ACTION:

The immediate corrective action was to verify that*the redundant circuits were operable.

5. SUBSEQUENT CORRECTIVE ACTION:

The defective heat tracing tape was replaced and tested within the time span specified by Technical Specification.

6. *ACTION -TAKEN *To PREVENT RECURRENCE:

No additional actions were deemed necessary.

7. GENERIC IMPLICATIONS:

A task force has reviewed the total spectrum of the Heat Tracing System and a Design Change is being prepared as a result of the Yask Force Study. Long lead items are being procured.